Michael Sivak shows us the numbers.

When even so-called experts don't know the difference, you must admit we have a problem here.

It's a smart thermostat for hydronic heating systems and is not such a dumb idea.

A landmark report released by The Nature Conservancy has demonstrated that effective conservation measures - far from simply benefiting the local biota - can also help alleviate poverty. The study, co-authored by Nature Conservancy policy advisor

Over the past few years journalists and commentators have denounced bottled water as an environmental evil. I can count myself as one of those after my article about the greenhouse gas emissions from producing and transporting one bottle of Fiji water

Scientists call it a remarkable discovery in an area where butterfly wildlife was thought to be well known.

Don't take your morning cup of coffee for granted. It may not be around in a few decades, according to a new report.

The UK grocery chain has long been a Fairtrade champion, but recently announced it would invent its own 'fairly traded' certification scheme.

Every bag they make is different, which creates a real marketing and display problem.

Despite the fact that representitives from Iran and the U.S. agree on virtually nothing else in the world, representatives from both countries at the U.N. Conference on Climate Change in Bali are among those pointing out the need for increased

Smog-choked, traffic-clogged Tehran may seem an unlikely candidate for an environmental honor, but the Iranian capital's aggressive recent moves to improve its public-transit

From child labor in the cocoa industry to human rights issues in the oil industry, we've often reported on the intersect between environmentalism and social justice—but all too often environmentalism and human rights

Shortlisted for the 2013 Aga Khan Awards, this elegant building makes good use of wasted stone generated from a town's large stonecutting industry.

In tribute to the region's salt lake, the architects of this unique restaurant used salt as an eco-friendly building material.

Most refugees live in refugee camps for an average of 12 years and most of that time it's in drafty, tattered tents. Now IKEA has a solar-powered camp house that is flatpack and quick to assemble.

Norwegian architect Marianne Borge is designing a series of them in different sizes.

In stark contrast to other flat-pack furniture designs, Groovebox is meant to be as simple to put together as possible, with no fasteners, tools, or mammoth assembly instructions needed.

This flexible line of furniture is made for people who are on the move a lot, and need furniture that's easy to assemble and customize.

Made right in downtown Los Angeles, this prefab unit is made with an innovative recyclable and recycled panel system.

Sleek and easy to assemble, this portable cabin offers a comfortable place to stay even in remote places.

With the winter solstice association with death and rebirth – these historic events of December 21st take on new resonance.

Chronicling the adventures of Mom, Izz, Dad, Mrs. Greener and more, The Greens is a new project conceived by photographer Ed Burtynsky and realized by TED and WBGH in Boston. The animated "online project" (the aren't calling it a show...yet) aims to

TreeHugger has been a fan of photographer Ed Burtynsky's work for a long time. We first spotted it here and have enjoyed watching him branch out into film with "Manufactured Landscapes", which was recently released in the US and the UK after debuting

A big book from a photographer who takes big pictures

Edward Burtynsky's collection called Water documents the role water plays in ecosystems, energy, cultural practices and disasters.

A TreeHugger hero visits our sister site.

It's about time that someone did, too.

Learn which brands should be avoided and which are making a sincere effort to provide ocean-safe options, then vote with your wallet.

Greenpeace has turned the global spotlight on Thai Union, the world's largest canned tuna producer and maker of Chicken of the Sea, for its horrific track record. Learn why you should boycott and what you can do to help.

Tuna producers are notorious for unethical labor and unsustainable fishing. It's time to learn more and take action.

Working with nature instead of against it, forest gardens promise abundance, as well as the kind of resilience a changing climate demands.

Stanley Jevons was right; develop a more efficient technology and people will figure out ways to use it that in the end, consume more energy

Using an additive, powder-based 3D printing process, experiments with abundant and renewable salt have created this translucent and lightweight structure.

Think bike lanes cost too much? Let's put it into a little perspective.

It's a nice idea, as long as it isn't sending the wrong message.

This looks like a long-needed solution to one of the key barriers to electric vehicle adoption, and I can hardly contain my excitement.

The English town of Frome has seen a significant drop in emergency hospital admissions since it began connecting ill residents with volunteers and support groups.

The nations once renowned for their way of eating now have the highest childhood obesity rates in Europe.

Indwell and Invizij Architects are doing incredible work, raising the bar for housing people in need.

Scientists examine two strategies to reduce anxiety.

Health care providers are alarmed by the rise in sleep disorders, but is it the kids or the parents who are in need of education?

U.S. doctors believes it's a serious public health concern that requires drastic action.

The source of 70 percent of New Delhi's water, the Yamuna River is filthy with sewage and garbage, but people are now being drawn to its banks by a new art exhibit that seeks to raise awareness about the river's plight.

Don't let artist Agustina Woodgate -- who says stuffing is "like looking into the soul" -- near your favourite stuffed teddy bear.

Artist Kebreab Demeke's colorful, functional sculpture is among around a dozen projects examining the meaning of 'the good life' on display at an exhibition in Berlin.

Pop-up gardens, urban farms, guerrilla bike lanes, examples of crowdsourced city planning, and other urban interventions will be the focus of the official U.S. Pavilion at the world's most prestigious architecture event.

Shinji Turner-Yamamoto's beautiful 'Global Tree Project' reveals the natural world with hanging trees, gilded boulders, and more.

Sixty-five porters and 75 yaks labored over two years to bring more than eight tons of trash down from the slopes of Mount Everest -- and into the hands of local artists.

Because bridges are for people.

A new exhibition in Toronto looks at sustainable development.